Location Determination Using Acoustic-Contextual Data

ABSTRACT

Systems and methods of determining a location of a mobile computing device associated with a real-time locating system are provided. For instance, a mobile computing device can determine a first location of the mobile computing device. The mobile computing device can then receive acoustic-contextual data that is correlated with the first location of the mobile computing device. The acoustic-contextual data can include data associated with one or more transmitting devices, and data associated with an environment proximate the one or more transmitting devices. The mobile computing device can receive one or more signals from at least one of the one or more transmitting devices, and can determine a more accurate second location of the mobile computing device based at least in part on the acoustic-contextual data and the one or more received signals.

FIELD

The present disclosure relates generally to real-time locating systems,and more particularly to determining a location of a mobile device basedat least in part on acoustic-contextual data associated with a real-timelocating system.

BACKGROUND

A common challenge in modern business is to locate important resourcesat any given time in a building or campus environment. Such resourcesinclude key personnel, critical pieces of equipment, vital records andthe like. For example, the personnel, the critical pieces of equipmentand the vital records are typically mobile, are often needed in avariety of locations during a typical working day, and are thereforeconstantly being relocated during the working day. Given that it isunproductive to divert other resources to locate these resources, it isdesirable to develop an approach that can locate these importantresources at any time in the environment of a building, campusenvironment and the like.

SUMMARY

Aspects and advantages of embodiments of the present disclosure will beset forth in part in the following description, or may be learned fromthe description, or may be learned through practice of the embodiments.

One example aspect of the present disclosure is directed to acomputer-implemented method of determining a location of a mobilecomputing device associated with a real-time locating system. The methodincludes determining, by a mobile computing device associated with areal-time locating system, a first location of the mobile computingdevice. The method further includes receiving, by the mobile computingdevice, acoustic-contextual data associated with the first location ofthe mobile computing device. The acoustic-contextual data includes dataassociated with one or more transmitting devices, and data associatedwith an environment proximate the one or more transmitting devices. Themethod further includes receiving, by the mobile computing device, oneor more signals from at least one of the one or more transmittingdevices. The method further includes determining, by the mobilecomputing device, a second location of the mobile computing device basedat least in part on the acoustic-contextual data and the one or morereceived signals.

BRIEF DESCRIPTION OF THE DRAWINGS

Detailed discussion of embodiments directed to one of ordinary skill inthe art is set forth in the specification, which makes reference to thefollowing appended figures.

FIG. 1 depicts an overview of an example real-time locating systemaccording to example embodiments of the present disclosure.

FIG. 2 depicts a flow diagram of an example method of determining alocation of a mobile computing device associated with a real-timelocating system according to example embodiments of the presentdisclosure.

FIG. 3 depicts a flow diagram of an example method of requestingacoustic-contextual data associated with a real-time locating systemaccording to example embodiments of the present disclosure.

FIG. 4 depicts an example system according to example embodiments of thepresent disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, one or moreexamples of which are illustrated in the drawings. Each example isprovided by way of explanation of the embodiments, not limitation of theinvention. In fact, it will be apparent to those skilled in the art thatvarious modification and variations can be made to the embodimentswithout departing from the scope or spirit of the present disclosure.For instance, features illustrated or described as part of oneembodiment can be used with another embodiment to yield a still furtherembodiment. Thus it is intended that aspects of the present disclosurecover such modifications and variations.

Real-time location systems have been developed using various wirelessprotocols, with perhaps the best known system being the globalpositioning system (GPS). While such location systems provide horizontallocation accuracies of the order of approximately 8 meters, such systemsdo not address all location scenario requirements. For example, manyscenarios demand location accuracies of better than 0.3 meters. Otherscenarios require vertical accuracies that distinguish between floors ina high rise building. Still other scenarios require contextual locationinformation, such as room-based information in an office building.Systems, such as indoor positioning systems, have been developed toattempt to address the requirements. However, such conventional indoorpositioning systems typically require large deployment efforts and/orinfrastructure costs. For instance, such systems may require LIDARsystems that implement full three-dimensional laser mapping of a desiredarea. As another example, such indoor positioning systems may useultra-wideband positioning techniques that require large amounts ofinfrastructure (e.g. transmitting devices, etc.).

In response to these demanding location requirements, embodiments of thepresent disclosure provide solutions to these requirements. Acousticsignals may be used to determine the location of mobile units, or tags,in three dimensions by transmitting signals from a plurality oftransmitting devices (which may be fixed to the walls or ceilings of abuilding). The acoustic signals may include encoded identifiers of therespective transmitting devices. These acoustic signals can be receivedby mobile computing devices. If the locations of the static transmittingdevices are known, the times of arrival of a set of acoustic signals atone of the mobile computing devices can be used to estimate the locationof that mobile device in the environment, using standard geometriccalculations.

For example, aspects of the present disclosure are directed todetermining a location of a mobile device based on acoustic-contextualdata (ACD) associated with a real-time locating system. For instance, amobile computing device associated with the real-time locating systemcan determine a first location of the mobile computing device. The firstlocation may be a coarse location determined by a wireless-basedlocation system, such as GPS. In some implementations, the firstlocation can be determined based on a unique identification associatedwith the real-time locating system. The mobile computing device may thenreceive acoustic-contextual data associated with the first location. Forexample, the acoustic-contextual data would be data that is determinedto be relevant to the first location. The acoustic-contextual data mayinclude data associated with one or more transmitting devices and/ordata associated with one or more acoustic properties of an environmentproximate the one or more transmitting devices. The mobile computingdevice may then receive one or more acoustic signals from at least oneof the one or more transmitting devices, and can determine a secondlocation of the mobile computing device based at least in part on theacoustic-contextual data and the one or more received acoustic signals.For example, the second location may be an improved (more precise)location of the mobile computing device compared to the first location.In another example, the second location may be a contextual-basedlocation, such as a room number in an office building, where the mobilecomputing device is located.

More particularly, the mobile computing device may be, for instance, amobile user computing device, such as a smartphone, tablet computer,wearable computing device, dedicated tag associated with a real-timelocating system, and/or any other suitable mobile computing devicecapable of being used in mobile operation. The first location can bedetermined by the mobile computing device based at least in part on aglobal positioning service (GPS), one or more Wi-Fi signals, one or moreBluetooth signals, one or more cellular signals, one or more positioningsensors implemented within the mobile computing device (e.g. inertialmeasurement unit(s), gyroscope(s), accelerometer(s), magnetometer(s),etc.), one or more pressure sensors implemented within the mobilecomputing device, one or more cameras implemented within the mobilecomputing device, and/or other suitable manner. In some implementations,the first location can be determined based at least in part on anidentification of a transmitting device, as encoded within a signalreceived from the transmitting device by the mobile computing device.For instance, the received signal can indicate a proximity to thetransmitting device.

The acoustic-contextual data may be provided to the mobile computingdevice responsive to a determination of the presence of the mobilecomputing device at the first location. For instance, upon adetermination of the first location, the first location can becorrelated with a real-time locating system. More particularly, areal-time locating system located proximate the first location may beidentified based at least in part on a known location of the real-timelocating system and the determined first location. In this manner, whenthe first location of the mobile computing device is within a thresholddistance from the known location of the real-time locating system, suchreal-time locating system can be identified using the known firstlocation.

In some implementations, the location of the real-time locating systemcan be stored in a lookup table or other data arrangement that maps oneor more real-time locating systems to respective locations at which thereal-time locating systems are deployed. The location can be expressedin the lookup table as any suitable data indicative of one or morelocations of the corresponding real-time locating system. For instance,the location(s) can be stored as coordinates (e.g. GPS coordinates),wireless network identifiers (e.g. WLAN service set identifier (SSID),Bluetooth Low Energy (BLE) identification, etc.), acoustic identifierassociated with the real-time locating system (e.g. provided by one ormore transmitting devices of the real-time locating system), or othersuitable location indicators. In some implementations, the location ofthe real-time locating system can be stored in the lookup table as ageofence or other boundary encompassing an area over which at least aportion of the real-time locating system is deployed.

In this manner, the first location may be determined in accordance withthe locations as expressed in the lookup table. For instance, inimplementations wherein the location is stored as coordinates, the firstlocation can be determined as coordinates in accordance with the lookuptable. As another example, in implementations wherein the location isstored as one or more wireless network identifiers, the first locationcan be determined based at in part on a detection of wireless networkidentifiers by the mobile computing device.

The identification of a proximate real-time locating system may beperformed by accessing the lookup table and performing a lookup for atable entry of the first location. For instance, in implementationswherein the location of the real-time locating system is stored as GPScoordinates or other data indicative of a physical location, the lookuptable can be accessed to determine if the lookup table includes an entryrepresenting a real-time locating system having a location within athreshold distance of the current location of the mobile computingdevice. As another example, in implementations wherein the location ofthe real-time locating system is stored as a wireless networkidentifier, the lookup table can be accessed to determine if the lookuptable includes a real-time locating system having a location associatedwith a wireless network identifier associated with a wireless networkproximate the mobile computing device. For instance, if the mobilecomputing device detects and/or is connected to a wireless network(WLAN, WPAN, etc.), the mobile computing device can access the lookuptable to determine if the lookup table includes an entry representing areal-time locating system associated with the identifier of the network.

In some implementations, the identification of a proximate real-timelocating system can be performed by the mobile computing device. In suchimplementations, the lookup table can be stored locally by the mobilecomputing device. In this manner, the mobile computing device canmonitor the location of the mobile computing device, and can access thelocally stored lookup table to determine if there is a real-timelocating system proximate the mobile computing device.

In some implementations, the lookup table can be stored in a remotecomputing device, such as a server computing device. In suchimplementations, the mobile computing device can monitor the location ofthe mobile computing device, and can provide data indicative of thelocation to the server device. The server device can then access thelookup table to determine whether there is a real-time locating systemproximate the mobile computing device.

As indicated, upon a determination that the mobile computing device islocated proximate a real-time locating system, acoustic-contextual dataassociated with the real-time locating system may be provided to themobile computing device. The acoustic-contextual data can be stored, forinstance, at the server device. For instance, in implementations whereinthe proximate real-time locating system is identified by the mobilecomputing device, the mobile computing device can provide a request forthe relevant acoustic-contextual data to the server device. The serverdevice may then provide the relevant acoustic-contextual data to themobile computing device. In implementations wherein the proximatereal-time locating system is identified by the server device, the serverdevice can provide the relevant acoustic-contextual data to the mobilecomputing device in response to the identification of the proximatereal-time locating system by the server device.

The acoustic-contextual data may include suitable data used tofacilitate a determination of the second location of the mobilecomputing device. For instance, the acoustic-contextual data can includedata associated with one or more transmitting devices of the real-timelocating system and/or data associated with an environment proximate theone or more transmitting devices. The data associated with the one ormore transmitting devices can include data descriptive of one or morecharacteristics of the signals (e.g. acoustic signals) to be transmittedby the transmitting device. Such data can include data indicative of atleast one of a sound pressure level, signal coding type, signalidentification, signal direction normal, signal spatial distribution,signal period, and/or other suitable data associated with the one ormore signals to be transmitted by the transmitting device.

The data associated with the environment proximate the one or moretransmitting devices may include data associated with an environmentover which the real-time locating system is deployed, such as one ormore rooms, spaces, structures, buildings, regions, etc. in which theone or more transmitting devices are located. More particularly, suchenvironmental data may include identifying data associated with theenvironment. Such identifying data can include unique identifier(s)associated with the location(s) of the one or more transmitting devices,or other suitable identifying data. For instance, the identifier(s) caninclude identifier(s) indicative of the respective room(s), building(s),campus(es), area(s), etc. in which the one or more transmitting devicesare located. The environmental data may further include data specifyingan organization, configuration, or hierarchy of the environment in whichthe one or more transmitting devices are located. For instance, suchdata can include data specifying a relationship between a particularroom and a particular building (e.g. data specifying that the room islocated within the building, specifying a location of the room withinthe building, etc.). As another example, such data can include dataindicative of an organization of one or more buildings located on acampus. In some implementations, the environmental data can includespatial relationship data specifying a relative physical locationbetween two or more environmental entities (e.g. room, area, campus,wall, object, item, pathway, etc.).

The environmental data may further include dimensional data associatedwith the environment. For instance, such dimensional data can includethe dimensions of one or more reflective surfaces (e.g. walls, ceilings,floors, objects, furniture, etc.) within a room in which a transmittingdevice is located. The dimensional data may further include dataindicative of the normal direction of such reflective surfaces. Theenvironmental data can further include data indicative of the acousticattenuation of such reflective surfaces at frequencies used in thesignal coding scheme. The environmental data may further include dataindicative of the relative location(s) of the one or more transmittingdevices within a particular room, building, area, etc. Moreparticularly, such environmental data can include an identifier of asurface (e.g. wall, floor, ceiling, etc. of a room) on which atransmitting device is located and/or data indicative of a locationand/or orientation of the transmitting device with respect to thesurface. The environmental data may further include atmospheric dataindicative of the speed of sound, temperature, pressure, humidity,acoustic attenuation, etc. within the environment. In certainembodiments, since the environmental data changes over time, theenvironmental data may be updated to reflect current environmentalconditions.

It will be appreciated that the acoustic-contextual data provided to themobile computing device may be expressed in any suitable format,structure, organization, configuration, etc. to facilitate acommunication of the acoustic-contextual data to the mobile computingdevice for purpose of determining the second location of the mobilecomputing device. In addition, it will be further appreciated that theacoustic-contextual data provided to the mobile computing device caninclude any combination of the data described above for purpose ofdetermining the second location. It will be further still appreciatedthat the acoustic-contextual data provided to the mobile computingdevice may include other suitable data associated with the real-timelocating system (e.g. one or more transmitting devices) and/or suitabledata associated with the environment over which the real-time locatingsystem is deployed without deviating from the scope of the presentdisclosure.

The acoustic-contextual data that is provided to the mobile computingdevice may be selected based at least in part on the first location. Insome implementations, the acoustic-contextual data for the entirereal-time locating system (e.g. for each transmitting device and/or theentire environment over which the real-time locating system is deployed)can be selected. In some implementations, acoustic-contextual data for asubset of the real-time locating system (e.g. a subset of transmittingdevices and/or a subset of the environment) can be selected. The subsetcan be determined based at least in part on the first location. In thismanner, the subset can include acoustic-contextual data for a subset oftransmitting devices and/or a subset of the environment proximate thefirst location. In some implementations, the acoustic-contextual datacan be selected based at least in part on the known locations of one ormore transmitting devices proximate the first location.

Upon receipt of the acoustic-contextual data by the mobile computingdevice, the mobile computing device may receive acoustic signals (e.g.acoustic signals) from one or more transmitting devices locatedproximate the mobile computing device. It will be appreciated that themobile computing device can receive the acoustic signals prior toreceipt of the acoustic-contextual data. For instance, in someimplementations the mobile computing device can be configured todetermine the appropriate acoustic-contextual data based at least inpart on an acoustic identifier encoded within the received acousticsignals. More particularly, the transmitting devices of the real-timelocating system may be configured to periodically transmit acousticsignals (or other suitable signals, such as radio frequency signals)that can be received by suitable mobile computing devices located withinthe broadcast range of the transmitting devices. In someimplementations, the acoustic signals can be ultrasonic signals having afrequency greater than about 20 kHz. As used herein, the term “about,”when used in reference to a numerical value, is intended to refer towithin 30% of that value.

In this manner, a mobile computing device located within the broadcastrange of one or more transmitting devices can receive acoustic signalsfrom the one or more transmitting devices. The acoustic signals can besignals propagating directly from the one or more transmitting devicesto the mobile computing device (referred to herein as “direct signals”),and/or signals that have been reflected by one or more reflectivesurfaces (referred to herein as “reflected signals”). The reflectivesurfaces can act as acoustic mirrors capable of reflecting acousticsignals (with some attenuation and a possible phase shift), and caninclude walls, ceilings, floors, furniture, objects, etc. located withinthe environment. The second location of the mobile computing device maybe determined based at least in part on the acoustic-contextual data andthe acoustic signals received from the one or more transmitting devices.The second location can be a more precise location than the firstlocation. For instance, the second location can be a three-dimensional(3D) location specifying an x-coordinate, a y-coordinate, and az-coordinate with respect to a 3D space. In some implementations, thelocation can be a two-dimensional location. In still furtherimplementations, contextual location information may be provided, e.g.,room number, floor number in an office building.

The mobile computing device may determine the second location based atleast in part on the acoustic-contextual data and the received acousticsignals (e.g. direct signals and/or reflected signals). The mobilecomputing device can be configured to determine the second locationusing various suitable location determination techniques. For instance,the mobile computing device can be configured to determine the secondlocation using a suitable triangulation, trilateration, multilateration,and/or other suitable technique. In this manner, the mobile computingdevice can determine various signal measurements associated with thereceived acoustic signals to facilitate determination of the location ofthe mobile computing device. Such signal measurements may include a timeof arrival, time of flight, angle of arrival, signal strength, and/ortime difference of arrival of the received acoustic signals. It will beappreciated that other additional and/or alternative suitablemeasurements can be used to facilitate determination of the locationmobile computing device. For instance, such measurements can include amotion induced frequency shift (e.g. Doppler shift), signal-to-noiseratio, signal phase, and/or other suitable measurements. In addition tothe acoustic characteristics of the one or more transmitting devices andenvironment (e.g. acoustic-contextual data), the mobile computing devicemay use the acoustic receive characteristics of its one or more acousticreceiver signal chains in the location determination. Such informationmay include microphone sensitivity, directivity, frequency dependence,and/or other suitable information. This information may be stored on themobile computing device or retrieved from the server from a databasebased at least in part on the model type number of the mobile computingdevice and/or other suitable identifying information associated with themobile computing device.

More particularly, the mobile computing device may determine the secondlocation based on a knowledge of properties of the acoustic signalstransmitted by the transmitting device(s) and the dimensionalspecifications of the environment in which the transmitting device(s)are located, as provided by the acoustic-contextual data. Suchknowledge, in conjunction with the signal measurements of the receivedacoustic signals, can be used to determine the second location using thevarious suitable location determination techniques. The acoustic signalscan encode identifying data (and/or other data) associated with therespective transmitting devices that transmitted the acoustic signals.In some implementations, upon receiving the acoustic-contextual data andthe acoustic signal(s), the mobile computing device can decode theacoustic signal(s) to determine the identification of the transmittingdevice(s) that transmitted the acoustic signal(s).

In some implementations, the mobile computing device can determinesignal paths of the received acoustic signals based at least in part onthe acoustic-contextual data, the time of arrival of the receivedacoustic signal(s), and/or a knowledge of the identity of thetransmitting device(s) that transmitted the signal(s). Such signal pathscan indicate an estimate of a reflection point of the acoustic signal atwhich the acoustic signal is reflected off of a reflection surfacetowards the mobile computing device. The mobile computing device canperform multilateration techniques based at least in part on the signalpaths and/or reflection points, and the signal measurements (e.g. timeof arrival, etc.) associated with the acoustic signals.

As indicated above, the systems and methods of the present disclosurecan provide a more accurate and efficient locating system relative toconventional real-time locating systems (e.g. indoor positioningsystems). More particularly, the information gained by the provision ofthe acoustic-contextual data can be used to increase the accuracy of thedetermined second location of the mobile computing device. In thismanner, the location of the mobile computing device can be determined ona room-by-room basis and/or on a sub-room basis, which can allow for amore accurate and robust location tracking. Such a real-time locatingsystem requires less processing power, and a less complex infrastructurethat is smaller and easily scalable. Such real-time locating systemfurther provides near real-time latency by utilizing numerous locationdetermination techniques (e.g. using acoustic signals in conjunctionwith the acoustic-contextual data). Such a real-time locating systemfurther provides an increased flexibility by allowing the use of varioustypes of mobile computing devices (e.g. smartphones, etc. already ownedby a user and/or dedicated positioning tags associated with thereal-time locating system).

The systems and methods of the present disclosure may be used in anumber of applications, such as location tracking, work flow, mobileequipment tracking, safety and compliance, mobile equipment management,staff location determination, or other suitable application. As aparticular example, the systems and methods of the present disclosurecan facilitate a provision of wayfinding information, such as routinginstructions, step-by-step directions, etc. from an origin to adestination. In some implementations, such wayfinding application can beused in conjunction with a mapping or routing application associated amobile unit of a user to facilitate the wayfinding with respect to a mapof a building, area, geographic region, etc. One example field of use iswithin the health care industry. For instance, a real-time locationsystem of the present disclosure can be implemented within a hospital toprovide patient tracking, patient flow, etc.

With reference now to the figures, example aspects of the presentdisclosure will be discussed in greater detail. For instance, FIG. 1depicts an example real-time locating system 100 according to exampleaspects of the present disclosure. The system 100 includes a mobilecomputing device 102, a transmitting device 104, and a remote computingdevice 106. In various implementations, the system 100 can include oneor more transmitting devices deployed throughout an environment (e.g.campus, building, room, area, etc.) in such a manner as to facilitate alocation determination of one or more mobile computing devices locatedwithin the environment. The transmitting devices can be deployed invarious suitable arrangements or configurations throughout theenvironment based on the needs or desires of the user.

The mobile computing device 102 can be configured to receive acousticsignals from the transmitting device 104 when located within a broadcastrange of the transmitting device 104. In this manner, the transmittingdevice 104 may be configured to, at various intervals, (e.g.periodically), transmit acoustic (e.g. ultrasonic) signals that can bereceived by one or more mobile computing devices (e.g. mobile computingdevice 102), and used for determining the location of these mobilecomputing devices.

The mobile computing device 102 includes a first location determiner108, an ACD coordinator 110, and a second location determiner 112. Thefirst location determiner 108 can be configured to determine a firstlocation of the mobile computing device. The first location determiner108 may determine the first location based at least in part on GPS, oneor more Wi-Fi signals, one or more Bluetooth signals, one or morecellular signals, one or more positioning sensors implemented within themobile computing device (e.g. inertial measurement unit(s),gyroscope(s), gyroscope(s), accelerometer(s), magnetometer(s), etc.),one or more pressure sensors implemented within the mobile computingdevice, one or more cameras implemented within the mobile computingdevice 102, and/or other suitable location determination technique. Inthis manner, the mobile computing device 102 may include a positioningsystem configured to leverage various suitable positioning signals (e.g.GPS signals, Wi-Fi signals, Bluetooth signals, cellular signals, sensorsignals, etc.) to determine a suitable first location of the mobilecomputing device 102.

The ACD coordinator 110 may be configured to facilitate the reception ofrelevant acoustic-contextual data by the mobile computing device 102based at least in part on the first location. For instance, in someimplementations, the ACD coordinator 110 can provide a request to theremote computing device 106 (e.g. via a network 116) foracoustic-contextual data associated with the first location. Asindicated above, the acoustic-contextual data may include dataassociated with one or more transmitting devices and/or the environmentproximate the first location. In this manner, the ACD coordinator 110can, for instance, access a lookup table stored by the mobile computingdevice 102 to identify a real-time locating system (e.g. real-timelocating system 100) proximate the first location. The lookup table maymap a plurality of real-time locating systems to a plurality ofrespective locations. In some implementations, the lookup table can mapacoustic-contextual data associated with the respective real-timelocating systems to their respective locations. The ACD coordinator 110can access the lookup table to determine if the first location, asdetermined by the first location determiner 108, corresponds to, or islocated within a threshold distance of a location stored in the lookuptable that is mapped to a real-time locating system.

The locations specified in the lookup table can be expressed as anysuitable location, as required by the ACD coordinator 110 and/or thelookup table. For instance, the locations may be expressed as GPScoordinates (e.g. latitude, longitude), network identifiers (e.g. Wi-FiSSID, Bluetooth ID, BLE beacon ID, etc.), and/or other suitableexpression. In this manner, the first location determiner 108 maydetermine the first location in order to identify the locations asexpressed in the lookup table. For instance, in implementations whereinthe lookup table specifies locations as GPS coordinates, the firstlocation determiner 108 can determine the first location as GPScoordinates using a GPS positioning system associated with the mobilecomputing device 102. As another example, in implementations wherein thelookup table specifies locations as network identifiers, the firstlocation determiner 108 can determine the location based on a proximityto one or more detected networks (e.g. based on a signal strength of thedetected network signals).

In some implementations, the lookup table can be stored at the remotecomputing device 106. The remote computing device 106 can include one ormore computing devices, and can, for instance, be a server, such as aweb server. In such implementations, the ACD coordinator 110 can providethe first location to the remote computing device 106, and the remotecomputing device 106 can access the lookup table to determine if thefirst location corresponds to a location specified in the lookup table.The remote computing device 106 can then provide the relevantacoustic-contextual data to the mobile computing device 102 based onthat location.

In some implementations, the acoustic-contextual data provided to themobile computing device 102 can be acoustic-contextual data associatedwith the entire real-time locating system corresponding to the firstlocation. In other implementations, the acoustic-contextual dataprovided to the mobile computing device 102 can be acoustic-contextualdata associated with a subset of the real-time locating system. Forinstance, such subset of the real-time locating system can correspond toa particular room, area, space, building, campus, etc. over which thereal-time locating system is deployed. In this manner, theacoustic-contextual data associated with the subset can beacoustic-contextual data specific to the particular room, area, space,building, campus, etc. The subset can be determined based on a proximityto the first location. For instance, if is determined that the firstlocation is a location within (or proximate) a particular room or area,acoustic-contextual data for the room or area can be provided to themobile computing device 102. In some implementations, theacoustic-contextual data can be associated with one or more transmittingdevices. For instance, in such implementations, each transmitting deviceassociated with the real-time locating system can have an associated setof acoustic-contextual data tailored to that transmitting device and/orthe environment in which the transmitting device is located. In thismanner, the lookup table can map various locations to varioustransmitting devices, and the selected acoustic-contextual data can beselected based at least in part on an association with such varioustransmitting devices.

The acoustic-contextual data may include data descriptive ofcharacteristics of the acoustic signals, such as data indicative of atleast one of a sound pressure level, signal coding type, signalidentification, signal direction normal, signal spatial distribution,signal period, carrier frequency, and/or other suitable data associatedwith the one or more signals to be transmitted by the transmittingdevice. The acoustic-contextual data may further include data associatedwith an environment in which the real-time locating system is located.Such environmental data can include a layout or organizational hierarchyof the environment, identifying data of the location within theenvironment (e.g. room, area, space, region, building, etc.) in whichthe transmitting device 104 is located, dimensional specifications ofone or more reflective surfaces (e.g. walls, ceilings, floors, objects,etc.) within the environment (e.g. within a room, area, region, etc. inwhich the transmitting device 104 is located), data indicative of therelative location of the transmitting device 104 within the environment,such as an identifier of the surface on which the transmitting device104 is located and/or a location and/or orientation of the transmittingdevice 104 with respect to the surface. The environmental data mayfurther include atmospheric data indicative of the speed of sound,temperature, pressure, humidity, etc. within the environment. In certainembodiments, since the environmental data changes over time, theenvironmental data may be updated to reflect current environmentalconditions.

As indicated, the mobile computing device 102 can further receiveacoustic signals from the transmitting device 104. The second locationdeterminer 112 may then determine a second location of the mobilecomputing device 102 based at least in part on the received acousticsignals and the acoustic-contextual data. More particularly, the secondlocation determiner 112 may use knowledge of the properties of theacoustic signals and of the environment in which the mobile computingdevice 102 is located, as specified in the acoustic-contextual data, toaid in the determination of the second location of the mobile computingdevice 102. The second location may be a 3D location specifyingcoordinates along an x-axis, a y-axis, and a z-axis.

The second location determiner 112 may be configured to determine thelocation of the mobile computing device 102 using various suitablelocation determination techniques. More particularly, the secondlocation determiner 112 may be configured to determine the secondlocation using triangulation, trilateration, multilateration, and/orother suitable techniques. In this manner, the second locationdeterminer 112 may determine various signal measurements associated withthe received acoustic signals to facilitate determination of thelocation of the mobile computing device. Such signal measurements mayinclude a time of arrival, time of flight, angle of arrival, signalstrength, and/or time difference of arrival of the received acousticsignals. The second location determiner 112 may further use the receivedacoustic-contextual data to determine the second location of the mobilecomputing device 102. As indicated, the acoustic-contextual data mayinclude data indicative of a plurality of signal characteristics orproperties of the acoustic signals transmitted by the transmittingdevice 104, as well as a plurality of characteristics or properties ofthe environment in which the transmitting device 104 is located. Thesecond location determiner 112 may use the knowledge of the signalcharacteristics and the knowledge of the environmental characteristicsto aid in the location determination. For instance, in someimplementations, the second location determiner 112 can determine one ormore reflection points on one or more reflective surfaces of theenvironment based at least in part on the acoustic-contextual data andthe received acoustic signals. As indicated, the reflection points canbe locations on the reflective surfaces wherein the acoustic signalswere reflected towards the mobile computing device. The second locationdeterminer 112 may treat one or more of the reflection points as“virtual transmitters” for use in, for instance, a multilaterationtechnique. In this manner, such multilateration technique may beperformed based on a knowledge of the timing of the receipt of theacoustic signals in addition to a knowledge of the signal paths of theacoustic signals within the environment.

In some implementations, the second location determiner 112 candetermine the second location based at least in part on one or moreposition sensors associated with the mobile computing device 102. Suchposition sensors can include one or more gyroscopes, accelerometers,magnetometers, inertial measurement units, etc. In such implementations,the second location can include an orientation and/or direction of themobile computing device 102. In this manner, the second location may bedetermined using suitable sensor fusion techniques. In someimplementations, the second location determiner 112 can determine thesecond location based at least in part on known characteristics or otherinformation associated with one or more acoustic receivers associatedwith the mobile computing device 102. For instance, thesecharacteristics and/or other information can include microphonesensitivity, directivity, frequency dependence, etc.

The real-time locating system 100 depicted in FIG. 1 is intended forillustrative purposes only. It will be appreciated that various othersuitable real-time locating system configurations can be used withoutdeviating from the scope of the present disclosure. For instance,although the system 100 depicted in FIG. 1 depicts only one mobilecomputing device 102 and one transmitting device 104, suitable real-timelocating systems in accordance with the present disclosure can includemultiple transmitting devices and mobile computing devices. As anotherexample, suitable real-time locating systems in accordance with thepresent disclosure can include various other suitable structures,components and/or computing devices to facilitate the determination of alocation of one or more mobile computing devices. As yet anotherexample, in some implementations, the acoustic-contextual data 114 canbe stored at the mobile computing device. In such implementations, themobile computing device may be configured to determine the secondlocation without the need for communication with the remote computingdevice 106.

FIG. 2 depicts a flow diagram of an example method (200) of determininga location of a mobile computing device according to example aspects ofthe present disclosure. The method (200) can be implemented by one ormore computing devices, such as one or more of the computing devicesdescribed with respect to FIG. 4. In some implementations, the method(200) can be implemented by the first location determiner 108, the ACDcoordinator 110, and/or the second location determiner 112 of FIG. 1. Inaddition, FIG. 2 depicts steps performed in a particular order forpurposes of illustration and discussion. Those of ordinary skill in theart, using the disclosures provided herein, will understand that thesteps of any of the methods described herein can be adapted, rearranged,expanded, omitted, or modified in various ways without deviating fromthe scope of the present disclosure.

At (202), the method (200) can include determining a first location of amobile computing device. The mobile computing device can be a userdevice, such as a smartphone, tablet computing device, laptop computingdevice, wearable computing device, dedicated positioning tag (e.g.active or passive) associated with a real-time locating system, or othersuitable mobile computing device capable of being used in mobileoperation. The first location may be determined by the mobile computingdevice based at least in part on a global positioning service (GPS), oneor more Wi-Fi signals, one or more Bluetooth signals, one or morecellular signals, one or more positioning sensors implemented within themobile computing device (e.g. inertial measurement unit(s),gyroscope(s), accelerometer(s), magnetometer(s), etc.), one or morepressure sensors implemented within the mobile computing device, one ormore cameras implemented within the mobile computing device, and/orother suitable location determination technique.

In some implementations, the first location can be determined to complywith requirements of a real-time locating system of the presentdisclosure. For instance, the first location can be a location thatindicates proximity to the real-time locating system. More particularly,the first location may be expressed as coordinates (e.g. GPScoordinates), as one or more network identifiers (e.g. Wi-Fi SSID, BLEbeacon identifier, Bluetooth network identifier, Zigbee networkidentifier, etc.) detected by the mobile computing device, or othersuitable location indicator. In this manner, determining the firstlocation may include determining a location configured to facilitate aprovision of relevant acoustic-contextual data to the mobile computingdevice. As will be described in greater detail below, the first locationmay be expressed in a format, type, etc. that is compatible with alookup table associated with the real-time locating system. The lookuptable can map or correlate a plurality of locations with real-timelocating systems.

At (204), the method (200) can include providing data indicative of thefirst location to a remote computing device. The remote computing devicemay be a server computing device associated with the real-time locatingsystem. In various implementations, the server may be located at thereal-time locating system and/or at a central location remote from thereal-time locating system. The mobile computing device and the remotecomputing device may communicate via a suitable network. As indicated,the data indicative of the first location may be data expressed inaccordance with a lookup table stored at the server that maps locationsto real-time locating system(s). In this manner, the lookup table maymap coordinates, network identifiers, and/or other location indicatorsto one or more real-time locating systems. In some implementations, oneor more locations in the lookup table can be expressed as geofences orother data defining boundaries or perimeters surrounding an area orregion. For instance, in such implementations, the mobile computingdevice can be configured detect a presence of the mobile computingdevice within the geofence, and can provide an indication of suchpresence to the remote computing device. As another example, in someimplementations wherein the lookup table specifies locations asgeofences, the mobile computing device can provide location data to theremote computing device (e.g. GPS coordinates), to facilitate adetection of the presence of the mobile computing device within thegeofence by the remote computing device. In some implementations, thelookup table can map a location to a subset of the environment overwhich a real-time locating system is deployed. For instance, the subsetcan include one or more buildings, rooms, areas, regions, transmittingdevices, etc. located within the environment associated with thereal-time locating system.

At (206), the method (200) can include receiving acoustic-contextualdata associated with the first location from the remote computingdevice. For instance, upon receiving the data indicative of the firstlocation from the mobile computing device, the remote computing devicecan determine whether the mobile computing device is located proximate areal-time locating system. In this manner, the remote computing devicemay access the lookup table and perform a lookup of the first locationto determine if the first location corresponds to (or is located withina threshold distance of) a location included in the lookup table. If thefirst location does correspond to such a location, the remote computingdevice may provide acoustic-contextual data to the mobile computingdevice. For instance, in implementations wherein the lookup tablespecifies locations as geofences, the remote computing device can beconfigured to detect whether the first location corresponds to alocation included in the lookup table based on a detected presence ofthe mobile computing device within a geofence associated with the lookuptable.

As indicated, the acoustic-contextual data may include data descriptiveof the signals transmitted by one or more acoustic transmittersassociated with the first location. Such data descriptive of the signalsmay include data indicative of at least one of a sound pressure level,signal coding type, signal identification, signal direction normal,signal spatial distribution, signal period, and/or other suitable dataassociated with the signals to be transmitted by the transmittingdevice. The acoustic-contextual data may further include datadescriptive of an environment proximate the first location. Suchenvironmental data may include identifying data associated with theenvironment. Such identifying data may include one or more identifiersassociated with the environment in which the one or more transmittingdevices are located, or other suitable identifying data. Moreparticularly, the identifier(s) may be associated with one or morerooms, areas, spaces, buildings, etc. in which the one or moretransmitting devices are located. The environmental data may furtherinclude data indicative of a layout or organization of the environment,dimensional data associated with the environment (e.g. dimensions andnormals of one or more reflective surfaces within a particular room),data indicative of the acoustic attenuation of one or more reflectivesurfaces within the environment at the frequencies used in the signalcoding scheme, data indicative of the relative location(s) of the one ormore transmitting devices within the environment, atmospheric dataindicative of the speed of sound, acoustic attenuation, temperature,pressure, humidity, etc. within the environment, and/or other suitabledata.

At (208), the method (200) can include receiving one or more signalsfrom one or more transmitting devices associated with the real-timelocating system. As indicated, the real-time locating system can includeone or more transmitting devices deployed throughout the environment.More particularly, the one or more transmitting devices may be deployedin such a manner as to facilitate a location determination of one ormore mobile computing devices in one or more desired areas, rooms,buildings, etc. throughout the environment. The one or more signals canbe acoustic signals transmitted by one or more transducers associatedwith the one or more transmitting devices. In some implementations, theone or more signals can be ultrasonic signals. The transmittingdevice(s) can transmit the acoustic signals, for instance, periodically,such that the acoustic signals can be received by one or more mobilecomputing devices located within the broadcast range of the respectivetransmitting device(s).

At (210), the method (200) can include determining a second location ofthe mobile computing device based at least in part on theacoustic-contextual data and the one or more received acoustic signals.In some implementations, the second location can be a 3D locationspecifying an x-coordinate, a y-coordinate, and a z-coordinate withrespect to a 3D space. The second location may be determined byleveraging the acoustic-contextual data in conjunction with the receivedacoustic signals to determine more precise (e.g. relative to the firstlocation) location of the mobile computing device. For instance, in someimplementations, the second location can be accurate to within about 12inches to about 24 inches. More particularly, the mobile computingdevice may utilize a knowledge of the location(s) of the transmittingdevice(s), the signal properties, and/or the environmental properties(e.g. dimensional specifications, atmospherics data, etc.) as providedby the acoustic-contextual data, and the received signals to determinethe second location. The acoustic-contextual data may be utilized to aidin a location determination technique, such as multilateration,trilateration, triangulation, and/or other suitable technique. Asindicated, such location determination techniques may be performed atleast in part using time of arrival, time of flight, angle of arrival,signal strength, time difference of arrival, and/or other suitablemetric associated with the received acoustic signals. In someimplementations, the second location may be determined based at least inpart on known characteristics or other suitable information associatedwith one or more acoustic receivers associated with the mobile computingdevice 102. For instance, these characteristics and/or other informationcan include microphone sensitivity, directivity, frequency dependence,etc.

In some implementations, the lookup table mapping various locations toreal-time locating system(s) may be stored by the mobile computingdevice. For instance, FIG. 3 depicts a flow diagram of an example method(300) of receiving acoustic-contextual data according to example aspectsof the present disclosure. The method (300) can be implemented by one ormore computing devices, such as one or more of the computing devicesdescribed with respect to FIG. 5. In some implementations, the method(300) can be implemented by the ACD coordinator 110, of FIG. 1. Inaddition, FIG. 3 depicts steps performed in a particular order forpurposes of illustration and discussion.

At (302), the method (300) can include accessing a lookup tableassociated with one or more real-time locating systems. As indicated,the lookup table may be stored by a mobile computing device associatedwith a real-time locating system. The lookup table may map locationswith real-time locating systems. In some implementations, the lookuptable can map locations to one or more subsets of an environment inwhich a real-time locating system is deployed. In this manner, thelookup table may correlate a location as indicated by GPS coordinates,network signals, etc. with a relative location within an environment(e.g. a particular room, building, area, region, etc. within theenvironment). In some implementations, the lookup table can map variouslocations to one or more transmitting devices associated with areal-time locating system.

At (304), the method (300) can include identifying a real-time locatingsystem associated with the first location based at least in part on theaccessed lookup table. More particularly, the mobile computing device,having accessed the lookup table, may perform a lookup of the firstlocation of the mobile computing device (e.g. as determined in (202) ofthe method (200)) to identify a real-time locating system associatedwith the first location, as specified by the lookup table. In someimplementations, identifying a real-time locating system can includeidentifying a relative location within an environment in which thereal-time locating system is deployed. In some implementations,identifying a real-time locating system can include identifying one ormore transmitting devices of the real-time locating system that areassociated with the first location, as specified by the lookup table.

At (306), the method (300) can include requesting acoustic-contextualdata associated with the identified real-time locating system, theidentified relative location within the environment, and/or the one ormore identified transmitting devices associated with the real-timelocating system. More particularly, requesting acoustic-contextual datamay include providing, via a network, a request to a remote computingdevice (e.g. a server device) for acoustic-contextual data associatedwith the identified real-time locating system, the identified relativelocation, and/or the one or more identified transmitting devices. Insome implementations, the request can include a request for specificacoustic-contextual data from the remote computing device. Uponreceiving such request, the remote computing device may provide therequested acoustic-contextual data to the mobile computing device. Invarious implementations, upon receiving the requestedacoustic-contextual data from the remote computing device, the mobilecomputing device can determine a second location of the mobile computingdevice. For instance, such location determination can be performed inaccordance with (208)-(210) of the method (200).

FIG. 4 depicts an example system 400 that can be used to implement themethods and systems of the present disclosure. In some implementations,the system 400 can be at least a portion of a real-time locating systemconfigured to determine the locations of various suitable mobilecomputing devices. The system 400 may be implemented using aclient-server architecture that includes a mobile computing device 410that communicates with one or more remote computing devices, such asserver 430. The system 400 can be implemented using other suitablearchitectures.

As shown, the system 400 can include a mobile computing device 410. Themobile computing device 410 can be any suitable type of mobile computingdevice, such as a smartphone, tablet, cellular telephone, wearablecomputing device, or any other suitable mobile computing device capableof being used in mobile operation. In some implementations, the mobilecomputing device can be a dedicated tag (e.g. passive or active) orother device for use in the real-time locating system. The mobilecomputing device 410 can include one or more processor(s) 412 and one ormore memory devices 414.

The one or more processor(s) 412 can include any suitable processingdevice, such as a microprocessor, microcontroller, integrated circuit,logic device, one or more central processing units (CPUs), graphicsprocessing units (GPUs) dedicated to efficiently rendering images orperforming other specialized calculations, and/or other processingdevices, such as a system on a chip (SoC) or a SoC with an integrated RFtransceiver. The one or more memory devices 414 can include one or morecomputer-readable media, including, but not limited to, non-transitorycomputer-readable media, RAM, ROM, hard drives, flash memory, or othermemory devices.

The one or more memory devices 414 can store information accessible bythe one or more processors 412, including instructions 416 that can beexecuted by the one or more processors 412. For instance, the memorydevices 414 can store the instructions 416 for implementing one or moremodules configured to implement a first location determiner 108, an ACDcoordinator 110, and/or a second location determiner 112, and/or othersuitable instructions.

Each of the first location determiner 108, ACD coordinator 110, andsecond location determiner 112 may include computer logic utilized toprovide desired functionality. Thus, each of the first locationdeterminer 108, ACD coordinator 110, and second location determiner 112can be implemented in hardware, application specific circuits, firmwareand/or software controlling a general purpose processor. In oneembodiment, each of the first location determiner 108, ACD coordinator110, and second location determiner 112 are program code files stored onthe storage device, loaded into memory and executed by a processor orcan be provided from computer program products, for example computerexecutable instructions, that are stored in a tangible computer-readablestorage medium such as RAM, hard disk or optical or magnetic media. Thefirst location determiner 108, ACD coordinator 110, and second locationdeterminer 112 can each correspond to one or more different programs,files, circuits, or sets of instructions. Likewise, two or more of thefirst location determiner 108, ACD coordinator 110, and second locationdeterminer 112 can be combined into a single program, file, circuit, orset of instructions.

The instructions 416 may further include instructions for implementing abrowser, for running a specialized application, or for performing otherfunctions on the mobile computing device 410. For instance, thespecialized application can be used to exchange data with server 430over the network 440. The instructions 416 can includeclient-device-readable code for providing and implementing aspects ofthe present disclosure. For example, the instructions 416 can includeinstructions for implementing an application associated with thereal-time locating system, or a third party application implementingwayfinding, asset tracking, or other services on the mobile computingdevice 410.

The one or more memory devices 414 can also include data 418 that can beretrieved, manipulated, created, or stored by the one or more processors412. The data 418 may include, for instance, acoustic-contextual data,sensor data, and/or other data.

The mobile computing device 410 may include various input/output devicesfor providing and receiving information from a user, such as a touchscreen, touch pad, data entry keys, speakers, and/or a microphonesuitable for voice recognition. For instance, the mobile computingdevice 410 can have a display 420 for presenting a user interface to auser.

The mobile computing device 410 can further include a positioning system424. The positioning system 424 can be any device or circuitry fordetermining the position of remote computing device. For example, thepositioning device can determine actual or relative position by using asatellite navigation positioning system (e.g. a GPS system, a Galileopositioning system, the GLObal Navigation satellite system (GLONASS),the BeiDou Satellite Navigation and Positioning system), an inertialnavigation system, a dead reckoning system, based on IP address, byusing triangulation and/or proximity to cellular towers, Bluetoothhotspots, BLE beacons, Wi-Fi access points or Wi-Fi hotspots, Wi-Fitime-of-flight, and/or other suitable techniques for determiningposition.

The mobile computing device 410 may also include a network interfaceused to communicate with one or more remote computing devices (e.g.server 430) over a network 440. The network interface can include anysuitable components for interfacing with one more networks, includingfor example, transmitters, receivers, ports, controllers, antennas, orother suitable components.

The mobile computing device 410 may further include a communicationsystem used to communicate with one or more transmitting devices, suchas transmitting device 450. The communication system can include, forinstance, one or more transducers (e.g. microphone devices) configuredto receive acoustic (e.g. ultrasonic) signals from the transmittingdevice 450.

In some implementations, the mobile computing device 410 can be incommunication with a remote computing device, such as a server 430 overnetwork 440. Server 430 can include one or more computing devices. Theserver 430 can include one or more computing devices, and can beimplemented, for instance, as a parallel or distributed computingsystem. In particular, multiple computing devices can act together as asingle server 430.

Similar to the mobile computing device 410, the server 430 can includeone or more processor(s) 432 and a memory 434. The one or moreprocessor(s) 432 can include one or more central processing units(CPUs), and/or other processing devices. The memory 434 can include oneor more computer-readable media and can store information accessible bythe one or more processors 432, including instructions 436 that can beexecuted by the one or more processors 432, and data 438. For instance,although the second location determiner 112 is depicted in FIG. 4 asbeing included in the mobile computing device 102, in otherimplementations, the second location determiner 112 can be included inthe server 430.

The data 438 may be stored in one or more databases. The one or moredatabases can be connected to the server 430 by a high bandwidth LAN orWAN, or can also be connected to server 430 through network 440. The oneor more databases may be split up so that they are located in multiplelocales.

Server 430 may also include a network interface used to communicate withcomputing device 410 over network 440. The network interface can includeany suitable components for interfacing with one more networks,including for example, transmitters, receivers, ports, controllers,antennas, or other suitable components.

Network 440 can be any type of communications network, such as a localarea network (e.g. intranet), wide area network (e.g. Internet),cellular network, or some combination thereof. Network 440 may alsoinclude a direct connection between the mobile computing device 410 andserver 430. Network 440 can include any number of wired or wirelesslinks and can be carried out using any suitable communication protocol.

The system 400 can further include one or more transmitting devices,such as transmitting device 450. The transmitting device 450 cantransmit acoustic signals (e.g. ultrasonic signals) such as describedwith regard to transmitting device 104 in FIG. 1. In someimplementations, the transmitting device 450 can transmit other suitablesignals, such as radio frequency signals. The transmitting device 450can be implemented using any suitable computing device(s). Although onlyone transmitting device is depicted in FIG. 4, it will be appreciated bythose skilled in the art that any suitable number of transmittingdevices can be included in the system 400.

The technology discussed herein makes reference to servers, databases,software applications, and other computer-based systems, as well asactions taken and information sent to and from such systems. One ofordinary skill in the art will recognize that the inherent flexibilityof computer-based systems allows for a great variety of possibleconfigurations, combinations, and divisions of tasks and functionalitybetween and among components. For instance, server processes discussedherein may be implemented using a single server or multiple serversworking in combination. Databases and applications may be implemented ona single system or distributed across multiple systems. Distributedcomponents may operate sequentially or in parallel.

While the present subject matter has been described in detail withrespect to specific example embodiments thereof, it will be appreciatedthat those skilled in the art, upon attaining an understanding of theforegoing may readily produce alterations to, variations of, andequivalents to such embodiments. Accordingly, the scope of the presentdisclosure is by way of example rather than by way of limitation, andthe subject disclosure does not preclude inclusion of suchmodifications, variations and/or additions to the present subject matteras would be readily apparent to one of ordinary skill in the art.

What is claimed is:
 1. A computer-implemented method of determining alocation of a mobile computing device, the method comprising:determining, by a mobile computing device, a first location of themobile computing device; requesting acoustic-contextual data associatedwith the first location of the mobile computing device, theacoustic-contextual data comprising first data associated with one ormore transmitting devices, and second data associated with anenvironment proximate the one or more transmitting devices; receiving,by the mobile computing device, the acoustic-contextual data; receiving,by the mobile computing device, one or more acoustic signals from atleast one of the one or more transmitting devices; and determining, bythe mobile computing device, a second location of the mobile computingdevice based at least in part on the acoustic-contextual data and theone or more received acoustic signals.
 2. The computer-implementedmethod of claim 1, wherein determining the first location of the mobilecomputing device comprises: determining the first location based atleast in part on data associated with one or more positioning systemsassociated with the mobile computing device, wherein an accuracy of thesecond location of the mobile computing device exceeds an accuracy ofthe first location of the mobile computing device.
 3. Thecomputer-implemented method of claim 1, wherein requesting theacoustic-contextual data further includes: providing, by the mobilecomputing device, third data indicative of the first location of themobile computing device to a remote computing device associated with thereal-time locating system.
 4. The computer-implemented method of claim1, further comprising: identifying, by the mobile computing device, thereal-time locating system; and wherein requesting theacoustic-contextual data comprises requesting the acoustic-contextualdata from a remote computing device associated with the identifiedreal-time locating system.
 5. The computer-implemented method of claim4, further comprising accessing, by the mobile computing device, alookup table correlating a plurality of locations to one or morereal-time locating systems that include the identified real-timelocating system; and wherein identifying, by the mobile computingdevice, the real-time locating system comprises identifying thereal-time locating system based at least in part on the lookup table andthe first location.
 6. The computer-implemented method of claim 1,wherein the first data associated with the one or more transmittingdevices comprises data associated with one or more acoustic signalstransmitted by the one or more transmitting devices.
 7. Thecomputer-implemented method of claim 6, wherein the data associated withthe one or more acoustic signals comprises data indicative of at leastone of a sound pressure level, signal coding type, signalidentification, signal direction normal, signal spatial distribution,and signal period associated with the one or more acoustic signals. 8.The computer-implemented method of claim 7, wherein the second dataassociated with the environment proximate the one or more transmittingdevices comprises identifying information associated with theenvironment, location data associated with the one or more transmittingdevices relative to the environment, data associated with one or morereflective surfaces within the environment, or atmospheric dataassociated with the environment.
 9. The computer-implemented method ofclaim 8, wherein the data associated with the one or more reflectivesurfaces comprises data indicative of the respective dimensions,normals, and acoustic attenuations of the one or more reflectivesurfaces.
 10. The computer-implemented method of claim 8, wherein theatmospheric data comprises data indicative of at least one of the speedof sound, acoustic attenuation, temperature, pressure, and humidity ofthe environment.
 11. The computer-implemented method of claim 1, whereinthe mobile computing device is a smartphone.
 12. Thecomputer-implemented method of claim 1, wherein the one or more acousticsignals are ultrasonic signals.
 13. The computer-implemented method ofclaim 1, wherein the acoustic-contextual data is provided to the mobilecomputing device by a remote server computing device associated with thereal-time locating system.
 14. A computing system comprising: one ormore processors; one or more memory devices, the one or more memorydevices storing computer-readable instructions that when executed by theone or more processors cause the one or more processors to performoperations, the operations comprising: determine a first location of amobile computing device; request acoustic-contextual data associatedwith the first location of the mobile computing device, theacoustic-contextual data comprising first data associated with one ormore transmitting devices, and second data associated with anenvironment proximate the one or more transmitting devices; receive theacoustic-contextual data; receive one or more acoustic signals from atleast one of the one or more transmitting devices; and determine asecond location of the mobile computing device based at least in part onthe acoustic-contextual data and the one or more received acousticsignals.
 15. The computing system of claim 14, wherein the first dataassociated with the one or more transmitting devices comprises dataassociated with one or more acoustic signals to be transmitted by theone or more transmitting devices.
 16. The computing system of claim 15,wherein the data associated with the one or more acoustic signalscomprises data indicative of at least one of a sound pressure level,signal coding type, signal identification, signal direction normal,signal spatial distribution, and signal period associated with the oneor more acoustic signals.
 17. The computing system of claim 16, whereinthe second data associated with environment proximate the one or moretransmitting devices comprises dimensional specifications associatedwith the environment, identifying information associated with theenvironment, location data associated with the one or more transmittingdevices relative to the environment, data associated with one or morereflective surfaces within the environment, or atmospheric dataassociated with the environment.
 18. The computing system of claim 17,wherein: the data associated with the one or more reflective surfacescomprises data indicative of the respective dimensions, normals, andacoustic attenuations of the one or more reflective surfaces; and theatmospheric data comprises data indicative of the speed of sound,temperature, pressure, and humidity of the environment.
 19. One or moretangible, non-transitory computer-readable media storingcomputer-readable instructions that when executed by one or moreprocessors cause the one or more processors to perform operations, theoperations comprising: determining a first location of a mobilecomputing device; requesting acoustic-contextual data associated withthe first location of the mobile computing device, theacoustic-contextual data comprising first data associated with one ormore transmitting devices, and second data associated with anenvironment proximate the one or more transmitting devices; receivingthe acoustic-contextual data; receiving one or more acoustic signalsfrom at least one of the one or more transmitting devices; anddetermining a second location of the mobile computing device based atleast in part on the acoustic-contextual data and the one or morereceived acoustic signals.
 20. A system for determining a location of amobile computing device associated with a real-time locating system, thesystem comprising: a first location determiner configured to determine afirst location of a mobile computing device; means for requestingacoustic-contextual data associated with the first location of themobile computing device, the acoustic-contextual data comprising firstdata associated with one or more transmitting devices, and second dataassociated with an environment proximate the one or more transmittingdevices; means for receiving the acoustic-contextual data; means forreceiving one or more acoustic signals from at least one of the one ormore transmitting devices; and a second location determiner configuredto determine a second location of the mobile computing device based atleast in part on the acoustic-contextual data and the one or morereceived acoustic signals.